Minimum Pitch For Corrugated Roof

The lysaght website states that they can be but this is not consistent with section 3 5 1 3 of the ncc which states that corrugated profile roofing must have a minimum pitch of 5 degrees as you ve indicated above.

Minimum pitch for corrugated roof.

It is the recommended slope as there is no guarantee if you opt for flatter pitch than this. Minimum pitch for corrugated metal roof just like other metal roofs the minimum pitch for a corrugated metal roof largely depends on the profile of the roof. That is a 14 degree angle. Minimum pitch for corrugated metal roof.

In most occasions a pitch of three in twelve is preferred but this should also take into consideration the manufacturer s recommendations as well the unique condition of the corrugated metal roof. The cladding should be supported at maximum centres as specified by the manufacturer and fixings should be a minimum of 50mm from sheet ends. Corrugated metal roofing has the same minimum pitch. The pitch is measured in inches of vertical rise per foot of horizontal run and the 5v crimp profile shown above requires a minimum slope of three in twelve or 3 12 3 inches vertically per 12 inches horizontally.

That means there is at least 3 of vertical rise to the roof slope for every 12 it goes back horizontally. However you can only use this pitch with built up roofing or specialized synthetic roofing. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. Most residential metal roofs require at least a 3 12 roof pitch and have no maximum roof pitch.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.